Ann: December 2016 Quarterly Update & Appendix 4C - quarterly, page-62

They're an option that if you choose to exercise, you can convert to a fully paid ordinary share by paying 25c per option / share

You have until December 17 to exercise them, and which point they expire and become worthless

Depending on the type in the investor you are, I'm assuming you're a small retail investor, if you were wanting to hold 1 year to get the CGT discount, the 1 year date starts when you convert them to fully paid shares (given they would expire 1 year from today)